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Vertex form is a form y=a(x-h)^2+k
y+47-3[ ] = -3 (x^2+8x+1[ ])
y +47 -3=--3 (x^2-2x+1[1 ])
Correction:I made a mistake in my previous answer. Here is corrected one.
y +47 -3=--3 (x^2-8x+1[16 ])
Comparing with y=a(x-h)^2+k
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